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Ocozocoautla de Espinosa, nestled within the verdant highlands of Chiapas, Mexico, occupies a geographically significant position at approximately 16.75° latitude and -93.36° longitude. The city’s terrain is characterized by rolling hills and valleys, a typical feature of the Chiapanecan landscape, with an elevation averaging around 1,200 meters above sea level. This altitude contributes to cooler temperatures compared to coastal regions, but also influences atmospheric stability, a key factor in air quality. Ocozocoautla sits within a transitional zone between the Sierra Madre de Chiapas mountain range and the lower plains, impacting prevailing wind patterns. The surrounding landscape is predominantly agricultural, with extensive coffee plantations and maize fields dominating the rural areas. This agricultural activity, while vital to the local economy, can contribute to particulate matter pollution, particularly during harvesting and burning seasons. The urban–rural gradient is relatively sharp; the city transitions quickly into agricultural land, limiting the potential for extensive industrial belts within immediate proximity. The Suchiate River flows nearby, providing a source of water but also potentially influencing local humidity and fog formation, which can trap pollutants. The city’s location within a subtropical highland climate means it experiences distinct wet and dry seasons, profoundly impacting regional air circulation and pollutant dispersion. The mountainous terrain further complicates air flow, creating localized areas of pollutant accumulation, especially during periods of reduced wind speed.

Ocozocoautla de Espinosa’s air quality follows a distinct seasonal pattern dictated by its subtropical highland climate. The wet season, typically spanning from May to October, brings frequent rainfall and increased humidity. While the rain naturally helps to cleanse the atmosphere by washing away particulate matter, the increased humidity can also contribute to the formation of ground-level ozone, particularly during periods of intense sunlight following rainfall. The dry season, from November to April, is characterized by lower rainfall and increased sunshine hours. This often leads to a greater accumulation of pollutants, especially during periods of stagnant air. Temperature inversions, common during the cooler months (December-February), trap pollutants near the ground, exacerbating air quality concerns. Agricultural burning, a traditional practice for land clearing and crop residue disposal, is most prevalent during the transition periods between the wet and dry seasons, significantly increasing particulate matter concentrations. During the wettest months (June-September), while rainfall offers some respite, persistent fog can also trap pollutants, creating localized air quality issues. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season and periods of agricultural burning. Outdoor activities are generally more favorable during the wetter months, although vigilance regarding ozone levels is still advised. The city’s topography can create microclimates where pollution persists longer, so local air quality conditions can vary significantly within Ocozocoautla.